Fuel supply system responsive to engine fuel demand

An apparatus for supplying fuel in a fuel system to an internal combustion engine comprising:

• an electric motor for driving a fuel pump;
• a fuel pump having an outlet configured to deliver fuel to the engine;
• a bypass fuel pressure regulator communicating with the pump outlet to regulate the pressure of fuel supplied to the engine and configured to divert excess fuel flow from the engine in response to the fuel demand of the engine;
• a fluid-activatable switch communicating with the pressure regulator and receiving the excess fuel from the pressure regulator and returning the excess fuel to a fuel tank;
• and
• an electric control circuit electrically connected to the switch, capable of being electrically connected to an electric voltage power source and to the electric motor for supplying an electric current to the electric motor;
• wherein said switch is manipulable into an electrically open position and an electrically closed position as determined by the rate of flow of excess fuel from the pressure regulator;
• and
• wherein said control circuit is capable of adjusting the magnitude of the power of the current supplied to the electric motor as dictated by the position of the switch such that the speed of said electric fuel pump motor is modulated in accordance with changes in the rate of flow of excess fuel and the position of the switch.